一种改进的VMD-SVD电能质量扰动去噪新方法

An Improved VMD-SVD Power Quality Disturbance Denoising Method

针对含有多频率复杂分量的电能质量扰动问题,提出一种改进的VMD-SVD电能质量扰动去噪新方法,通过能量收敛因子与PSO优化VMD参数,选取最优的参数k、α值,VMD分解的模态分量与原始信号进行互相关系数和阈值的计算,大于阈值的模态分量IMF通过SVD进行再次去噪。仿真与试验结果表明,改进的VMD-SVD电能质量扰动去噪方法,相较于EMD-SVD、SVD在含有复杂分量的扰动具有更好的去噪效果;对单一分量扰动的去噪采用EMD-SVD去噪的方法优于SVD去噪效果。

Aiming at the problem of power quality disturbances containing multi-frequency complex components,an improved VMD-SVD power quality disturbance denoising method is proposed.The VMD parameters are optimized through the energy convergence factor and PSO,and the optimal parameters k andαare selected.The modal components decomposed by VMD and the original signal are calculated for correlation coefficient and threshold.The modal component IMFs that are larger than the threshold are denoised again by SVD.Simulation and experimental results show that the improved VMD-SVD power quality disturbance denoising method has a better denoising effect than EMD-SVD and SVD in disturbances containing complex components;The denoising effect of single component disturbance by EMD-SVD is better than that of SVD.